NASA telescopes in Chile have discovered a comet from interstellar space, making its closest approach in October.

The Oort cloud is a shell of icy bodies that surrounds the solar system. Many comets that frequent our inner solar system originate from this distant region.

This is only the third known interstellar object to pass through our cosmic neighborhood, following in the footsteps of ...

The Oort cloud, if it indeed exists, likely isn’t unique to our own solar system. Correa Otto says that some astronomers believe these clouds exist around many solar systems.

The monstrous 85-mile-wide comet C/2014 UN271 is the second most distant body originating from the Oort Cloud found to be ...

As such, it seems the Oort cloud is more of a shell or bubble around our solar system than a disk like the Kuiper Belt. These long-period comets include C/2013 A1 Siding Spring, which passed close to ...

It appears our solar system is getting more popular with out-of-towners. Astronomers have found a third interstellar object, ...

Scientists have unlocked one of the solar system's many secrets from an unexpected source: a planetarium show.

“It’s completely plausible for our solar system to have captured such an Oort cloud planet,” says Nathan Kaib, a co-author on the new work and an astronomer at the Planetary Science Institute.

You’ll find it in every astronomy textbook: the spherical cloud of a trillion lumps of rock and ice that forms the outermost boundary of our solar system.The Oort cloud’s distant edge could ...

The Oort cloud spans a great distance, from around 2,000 to between 100,000 and 200,000 astronomical units (au). For reference, 1 au is equivalent to nearly 150 million kilometers (93 million miles), ...